Patents by Inventor Bjorn Stig Erik Johansson

Bjorn Stig Erik Johansson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Decoding method and apparatus
    Patent number: 6728319
    Abstract: A decoder in a communication system using channel optimized vector quantization and including an encoder stores active encoder centroids ci corresponding to active indices i, an active index being defined as an index that has a predetermined source probability pi>0 of being selected by the encoder for transmission to the decoder, source probabilities pi and the bit error rate epsilon to dynamically estimate a decoded vector using a sub-optimal algorithm in which only the most significant contributions are considered.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: April 27, 2004
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Per Johan Anders Nyström, Björn Stig Erik Johansson, Tomas Gunde Svensson
  • Reducing sparseness in coded speech signals
    Patent number: 6301556
    Abstract: An apparatus and method for reducing sparseness in a coded speech signal. Sparse codebook values are generated from a codebook. An anti-sparseness operation is performed on the sparse codebook values to produce output codebook values having a greater density of non-zero values than the sparse codebook values. The output codebook values are processed by a speech processor to generate an encoded speech signal during an encoding operation or a decoded speech signal during a decoding operation.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: October 9, 2001
    Assignee: Telefonaktiebolaget L M. Ericsson (publ)
    Inventors: Roar Hagen, Björn Stig Erik Johansson, Erik Ekudden, Willem Baastian Kleijn
  • Reducing sparseness in coded speech signals
    Patent number: 6029125
    Abstract: Sparseness is reduced in an input digital signal which includes a first sequence of sample values. An output digital signal is produced in response to the input digital signal. The output digital signal includes a second sequence of sample values, which second sequence of sample values has a greater density of non-zero sample values than the first sequence of sample values.
    Type: Grant
    Filed: July 7, 1998
    Date of Patent: February 22, 2000
    Assignee: Telefonaktiebolaget L M Ericsson, (publ)
    Inventors: Roar Hagen, Bjorn Stig Erik Johansson, Erik Ekudden, Willem Baastian Kleijn